Sweet Potato Dessert Soup | IDDSI Level 3 Recipe
IDDSI Level 3 (Liquidised) | 35 minutes | Easy
Sweet potato ginger soup (番薯糖水) is one of Hong Kong’s most beloved street desserts — chunks of sweet potato in a warming, ginger-infused clear sugar syrup. The traditional version is too chunky for Level 3 or 4 diets. This Level 3 adaptation blends the sweet potato smooth and extends the liquid base significantly to produce a flowing, flowing-consistency soup that meets IDDSI Level 3. The result retains the warming ginger flavour and natural sweetness of the original in a completely flowing, pourable form. Both yellow sweet potato (沙地番薯) and purple sweet potato (紫番薯) work well — purple produces a striking lavender-coloured soup.
Ingredients (3–4 servings)
- 350g sweet potato (yellow or purple variety), peeled and cut into 3cm chunks
- 800ml water
- 3 slices fresh ginger (approximately 3–4mm thick), bruised with the back of a knife
- 3–4 tablespoons brown sugar, rock sugar (冰糖), or coconut sugar (adjust to taste)
- ¼ teaspoon salt (enhances sweetness)
Method
- Peel and cut the sweet potato into 3cm chunks. Place in a saucepan with the water and bruised ginger slices.
- Bring to a boil over high heat, then reduce to a medium simmer. Cook for 20–25 minutes until the sweet potato is completely tender and collapses under spoon pressure (test by pressing a piece against the pot wall).
- Remove the ginger slices and discard.
- Transfer the sweet potato and all the cooking liquid to a blender. Blend on high speed for 60 seconds until completely smooth.
- Pass the blended soup through a fine mesh sieve into a clean saucepan to remove any fibrous skin fragments.
- Add the sugar and salt. Return to medium heat, stirring until the sugar dissolves completely. Taste and adjust sweetness.
- Adjust consistency: the soup should flow freely when tilted from a spoon. If too thick (holds shape rather than flowing), add warm water 50ml at a time and stir well. If very thin, simmer uncovered for 5 minutes.
- Level 3 check: Pour from a spoon held 15cm above the bowl — the soup flows in a continuous stream. It does not hold any shape. This is Level 3 (Liquidised).
Texture Test
- Spoon flow: Flows freely and continuously when tilted — Level 3 compliant
- No solids after fine straining
- Smooth and uniform — no sweet potato lumps or fibrous skin
- Consistent colour throughout
Colour and Flavour Notes
Yellow sweet potato (沙地番薯): Warm orange colour; sweet, earthy, slightly chestnut-like flavour.
Purple sweet potato (紫番薯): Striking lavender-purple colour; slightly less sweet, more earthy. The anthocyanin pigment is a powerful antioxidant. The purple colour can fade slightly after blending — this is normal.
Ginger Adjustment
The ginger level in this recipe produces a mild warming note. For patients who prefer a stronger ginger flavour, increase to 5–6 slices and extend the simmering time by 5 minutes to extract more ginger flavour into the liquid. For patients who are sensitive to ginger or who find it too stimulating, reduce to 1–2 slices.
Nutritional Notes
Sweet potato is rich in beta-carotene (yellow variety) or anthocyanins (purple variety), Vitamin C, potassium, and dietary fibre. Blending retains all these nutrients. This dessert soup provides approximately 100–130 kcal per serving — useful as a between-meal supplement for patients with inadequate intake. The natural sugar content means patients with diabetes should have smaller portions and monitor accordingly.
Storage
Refrigerate for up to 3 days. Reheat gently over low heat, stirring well. The soup may thicken when cold due to starch retrogradation — add a small amount of warm water and stir to restore Level 3 consistency before serving.
Caregiver Notes
This is an excellent between-meal supplement for Level 3 patients. Its familiar flavour profile — a classic Hong Kong dessert — makes it particularly well accepted by elderly patients who may be reluctant to try unfamiliar dysphagia-adapted foods. The natural sweetness also helps disguise the slightly unusual texture of a fully blended food. Serve warm but not scalding.